Improvement in blow-off cocks



.S. MYERS.

BLOW OFF coca.

No.183.197. Patented on. 10. 1876.

MLLEEEES.

JAMES R OSGOOD fic'CO BOSTON UNITED STATES PATENT QFFIOE.

SAMUEL MYERS, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN BLOW-OFF COCKS.

Specification forming part of Letters Patent To all whom it may concern:

Be it known that I, SAMUEL MYERS, of the city of Pittsburg, in Alleghenycounty, State of Pennsylvania, have invented a new and usefulImprovement in Blow-01f Valves for Steam- Boilers, which improvement isfully set forth in the following specification, reference being had tothe accompanying drawings, ofwhich- Figure l is a vertical section,showing all parts of my improved blow-oft valve; and

of chamber B, and provide it intermediately with a groove or channel,at, around its central portion, opposite the inlet-opening. It is,however, requisite the vaLve A shall fit sufficiently close at thebottom to prevent pieces of thin scale from entering between it and theinner sides of the casing M, but at the same time permit the passage ofwater for the purpose of washing away any solid matter that may havelodged on the seat, so that the valve will seat perfectly. 4 In case apiece of scale should be caught under the valve while passing theinlet-opening, and project into the chamber, it will be sheared 01fbetween the edge of the inlet and the edge of the descending valve, andwill be washed out, as before stated, through the discharge-openingE;and, again, the cylindrical chamber serving as a guide to the looselyfitting valve, I am enabled to dispense with the usual bridge orguide-piece and the lower stem of the valve.

To secure the passage of a sufficient amount No. 183,197, dated October10, 1876; application filed July 1, 1876.

of water while the valve is closing, I provide it with the aforesaidcircumferential groove or channel G at a point opposite theinlet-orifice O. This groove permits the water to pass around the valveand thus escape downward in equal volume or with equal force on allsides of the valve.

By my improved construction, therefore, I not only provide for guidingthe valve in its chamber, and preventing passage of scale while thevalve is closing, but at same time cause the valve-seat to be washed bya descending current, so that the valve will be properly seated. Thevalve likewise operates with little friction, owing to its being looselyfitted, while it is guided with such accuracy as to cause it to beseated accurately. The

\valve is properly provided with a shouldered let, I J, to adapt it forattachment to the inverted T-shaped end I J 2 of the stem.

I do not claim, broadly, a valve provided with a circumferential groove,nor a valve fitting loosely in its chamber or socket; but

I claim as m y invention The improved blow-oft cock for steam-boilers,composed of the casing M, provided with the inlet-tube O, the annularbeveled seat, and downward discharge-tube, and the valve A, providedwith a circumferential groove at a point opposite the inlet, and fittedin said casing, as shown and described, whereby it is adapted to beguided accurately to its seat, also shear off, as it descends, any scalethat may project from the inlet-opening, but to exclude scale when oncesaid inlet has been passed, and yet permit the downward escape of water,as specified.

S AM UEL MYERS.

Attest H. J. BIGGER, ANDW. PATTERSON.

